zsh: always make apps assume there are 256 colors
zsh: always make apps assume there are 256 colors

We set it here to make this take effect globally. I can't remember the
last time I used a terminal that did not support 256 colors, so this is
probably fine.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg